101 lines
1.8 KiB
C
101 lines
1.8 KiB
C
/**
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* @file bh1750.c
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* @author Myth
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* @version 0.2
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* @date 2021.10.15
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* @brief BH1750 驱动
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*/
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#include "systick.h"
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#include "softi2c.h"
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#include "bh1750.h"
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#define SLAVE_ADDR_WR 0x46
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#define SLAVE_ADDR_RD 0x47
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#define I2C_Start SoftI2C_Start(&bh1750_i2c)
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#define I2C_Stop SoftI2C_Stop(&bh1750_i2c)
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#define I2C_WriteByte(__byte__) SoftI2C_WriteByte(&bh1750_i2c, __byte__)
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#define I2C_ReadByte SoftI2C_ReadByte(&bh1750_i2c)
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#define I2C_Ack SoftI2C_Ack(&bh1750_i2c)
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#define I2C_NAck SoftI2C_NAck(&bh1750_i2c)
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#define I2C_WaitAck SoftI2C_WaitAck(&bh1750_i2c)
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SoftI2C_TypeDef bh1750_i2c;
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/**
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* @brief 初始化 BH1750
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*/
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void BH1750_Init(void)
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{
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bh1750_i2c.SDA_GPIO = BH1750_GPIO;
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bh1750_i2c.SDA_Pin = BH1750_SDA_PIN;
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bh1750_i2c.SCL_GPIO = BH1750_GPIO;
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bh1750_i2c.SCL_Pin = BH1750_SCL_PIN;
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bh1750_i2c.Delay_Time = 5;
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SoftI2C_Init(&bh1750_i2c);
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Delay_ms(80);
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I2C_Start;
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I2C_WriteByte(SLAVE_ADDR_WR);
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I2C_WaitAck;
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I2C_WriteByte(0x01);
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I2C_WaitAck;
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I2C_Stop;
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}
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/**
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* @brief 向 BH1750 发送测量命令。需等待 180ms 后才能读取数据
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*/
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void BH1750_Start(void)
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{
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I2C_Start;
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I2C_WriteByte(SLAVE_ADDR_WR);
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I2C_WaitAck;
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I2C_WriteByte(0x10);
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I2C_WaitAck;
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I2C_Stop;
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}
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/**
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* @brief 读取 BH1750 数据。在发送测量命令至少 180ms 后调用
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* @retval 读数
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*/
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float BH1750_Read(void)
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{
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uint8_t i;
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uint8_t byte1;
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uint8_t byte2;
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I2C_Start;
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I2C_WriteByte(SLAVE_ADDR_RD);
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I2C_WaitAck;
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byte1 = I2C_ReadByte;
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I2C_Ack;
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byte2 = I2C_ReadByte;
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I2C_NAck;
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I2C_Stop;
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return (float)((byte1 << 8) + byte2) / 1.2;
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}
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/**
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* @brief 发送测量命令，等待 180ms 并读取 BH1750 数据
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* @retval 读数
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*/
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float BH1750_StartAndRead(void)
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{
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BH1750_Start();
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Delay_ms(180);
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return BH1750_Read();
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}
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